Fluoroscope.



C. E. CAMPBELL.

ILUOROSGOPE.

APPLICATION FILED 111111.12, 1910.

z SHEETS-s112111* 1.

Patented Feb. 14, 1911.

C. E. CAMPBELL'.

FLUOROSGOPB.

APPLICATION FILED 111111.12, 1910.

Patented Feb. 14, 1911.

2 SHEETS-SHEET 2.

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Uff/755555.

UNITED STATES PATENT OFFICE.

CHARLES E. CAMPBELL, 0F LYNN, MASSACHUSETTS.

FLUOROSCOPE.

To all whom 'it may concern:

Be it known that I, CHARLES E. CAMP- BELL, a citizen of the United States, residingat Lynn, in the countyof Essex and State of Massachusetts, have invented certain new and useful Improvements in Fluoroscopes, of which the followingl is a specification.

My invention relates to improvements in 'luoroscopes and the objects of my improvements are simplicity and economy in construction and convenience and efiiciency in use.

In the accompanying drawing z--Figure l is a side elevation of my fluoroscope in position for use. Fig. 2 is a bottom View ot' the handle side of the same with the handle strip and handle removed. Fig. 3 is a similar View of the same in collapsed position. Fig. 4 is a bottom view of the handle strip. Fig. 5 is a side view of the handle. Fig. (S is a central longitudinal sectional View of my luoroscope on an enlarged scale. Fig. 7 is a similar view of the same in the position shown in Fig. 3 and on the same scale as in the said figure. Fig. 8 is a sectional view in the position shown in Fig. 7 on an enlarged scale, the line of section being to one side of the center and passing through one of the jointed elbows, and the cloth covering being omitted, the position of the parts in expanded position being indicated by broken lines.

A is my improved luoroscope and comprises at the front end a screen B and protecting devices therefor to be described and at the back end a head piece C shaped to fit the face so as to shield the eyes of the observer in an ordinary manner, and intermediate thereto a body D composed of collapsible material and is provided with means for retaining the said body either in extended or collapsed condition as desired. The said screen B is generally rectangular and is contained in a screen frame E to which is secured the front end of the said body D and the head piece C at the junction with the body D is correspondingly shaped and of smaller dimensions than those of the screen so that the said bodv has a truncated pyramidal form. The sai screen frame E comprises a rectangular frame Work having side walls of appreciable depth and inclined relatively one to the other to conform to the truncated pyramidal form described and which may be made up of four strips of Specication of Letters Patent.

Application filed March 12, 1910.

Patented Feb. 14, 1911.

Serial No. 548,869.

Wood comprising a pair of longitudinal strips 10 and a pair of end strips l1. The said strips 10 and 1l may be provided-on their outer faces with a longitudinal groove 12, opening outwardly and forming with the said end strips 11 a screen receiving space, within which the said screen B and its protecting devices may be retained in any ordinary manner, as by a rectangular end frame F which may fit the said screen frame and overhang the screen B and retain the same in the said groove 12 the said end frame F being retained in position by screws 13. The said screen B and its protecting devices comprise the screen proper B which may be made up of paper on the face of which is sprinkled and secured by some adhesive in an ordinary manner crystals of some fluorescent material, such as platinum-barium-cyanid. On the 'front or outer side of the said screen proper B is the usual outer protection G comprising a layer of card board. As an inner protection I provide immediately back of the said screen proper B a backing of glass II, which glass protects the screen from injury by the folding mechanism to be described while coperating with the same in retaining the device in the f0lded condition, and also while permitting freely the observance of the fluorescent effects upon the screen by the observer, mitigates the dangers of exposure of the eyes and face of the observer to the injurious effects of the X-rays. I find that for thislatter protection of the observer a lead glass is more eicient than any other kind of glass and on this account I prefer to use such glass. At the said junction of the head piece C and the body D is provided a head piece frame I comprisin a rectangular frame Work of wood, to wlnch the said head piece and body are attached, which frame 1s preferably made of a single fiat iece, having outside walls adapted to receive a finishing strip M of plush and the inner Walls rounded from the extreme outer edge inward. The said head 'piece C may be made of leather, and have the outer edge shaped generally to fit the face, the extreme bow J, located preferably as shown, one

each side of the longitudinal central plane,

and comprising each a pair of strips of wood, iber, or other suitable material, joined togetherby a hinge connection 15, comprising an ordinary hinge located on the outer side of the strip and having their ends remote from said hinge 15 connected by spring hinges 16 to the frames. The piece or strip 17 joined to the said head piece frame I is preferably of shorter length than the piece 18 joined to the screen frame. The hinge 16 at the head frame l is located on the bottoni face of the same. The spring hinge 1.6 at the screen frame E is located near the upper edge of the same. When in extended position the said spring hinges 16 tend to spring the attached pieces 17 and 18 outwardly, bringing the edges adjacent the hinge connection 15 in abutment, corresponding to a position of alinement of the two parts or pieces. When in collapsed position the two pieces are brought essentially into abutment, and the hinge joint 15 is brought into abutment with the back face of the glass H, so that by the coperation of the-said glass H and the two elbow jointed members J, the individual tendency of each of the said jointed members J to open out is adapted to coact with the other to produce a combined restraining e'ect tending to hold the members and the body D in a collapsed condition. Between the extreme positions or conditions of collapse and extension there is a critical point at which position the parts described will be in unstable equilibrium. 1

My liuoroscope is provided with a handle K which l prefer to supportJ appreciably remote from the screen B to avoid danger of exposure of the hand of the operator and which I secure in an ordinary manner, as by a screw thread 19 to a removable handle strip L at essentially the middle 20, the said'strip being removably attached by its ends tothe screen frame E and head frame I, and at the same time the load of the entire device is essentially balanced near the point of attachment of the handle K. As shown the said screen frame E and head frame l are each provided with an outwardly projecting screw 21 having a head and the handle strip L is provided at one end with a slot 22 adapted to engage with one of said screws and at the other end with a hole 23 adapted to engage with the other screw 21, the said latter end being provided with av locking device 24 comprising a hook pivotally mounted and adapted to engage with the head of the said latter screw. rl`he said handle plate L mounted in the manner described is adapted to c0 operate with the elbow members d" in maintaining a rigidity of the structure of the device when arranged in the extended condition.

l claim as my invention 1. ln a iuoroscope having a collapsible body, means for retaining the said body in collapsed condition comprising a multiple of elbow joints formed` each of two arms joined together at one end by a hinge connection and having the other ends pivotally connected to the body ends and sprinof means tending toopen out the said arms into the extended position and a plate in abutment with said hinge connections, and bringing the said spring means into coaction and opposition.

2. ln a collapsible luoroscope comprising a collapsible body and a multiple ot elbow joints composed each of a pair of arms held together by a hinge connection and provided with springs tending to extend each of the said pairs of arms to a position of longitudinal alinement and the extreme ends of the said body, means for bringing said springs into coaction so as to retain the said arms in collapsed condition comprising a plate in Contact with the said hinge connection.

ln a noroscope having a iexible body provided with ends, a screen located at one of the said ends, and a sighting opening at the other end, means for maintaining the said body in collapsed condition comprising a pair of elbow joints composed each of arms having their inner ends connected by a hinge joint and the outer ends connected to said body ends by spring hinges and a flat plate in abutment with the said hinge joints,

the said spring hinges tending to open out the said elbow joints individually, and the said plate serving to bring the said springs into coaction so as to prevent such opening out.

4. ln a fiuoroscope having a flexible body provided with ends, a screen located at one of the said ends anda sighting opening at the other end, means for maintaining the said body in collapsed condition comprising pairs of elbow joints composed each of arms having their inner ends connected by a hinge joint and the outer ends pivotally con` nected to said body ends, and spring means tending to open out the said elbow joints individually, and a plate in abutment with the said hinge joints and thereby bringing said spring means into coaction so as to prevent such opening out, and the said plate located between 'the said screen and sighting opening and composed of transparent material.

5. ln a iiuoroscope having a body provided with a head end and a screen end provided with a screen, means for being colf .lapsed and extended and means for being end, and the said means for. being mainsaid head end and screen end, and comtained in collapsed condition comprising a posed of lead glass.

at plate in abutment with the said hinge joints and seving to bring the said spring CHARLES E' CAMPBELL' 5 hinges into coaction so asfto prevent the Witnesses:

individual opening out of the said elbow FRED R. CAMPBELL,

joints, the said plate located between the MAE L. HAGAN. 

